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-rw-r--r--gc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/gc.c b/gc.c
index d99b9c496f..d967fd8576 100644
--- a/gc.c
+++ b/gc.c
@@ -537,7 +537,7 @@ rb_objspace_free(rb_objspace_t *objspace)
#define HEAP_ALIGN_MASK 0x3fff
#define HEAP_SIZE HEAP_ALIGN
-#define HEAP_OBJ_LIMIT (HEAP_SIZE/(unsigned int)sizeof(struct RVALUE) - (sizeof(struct heaps_slot)/(unsigned int)sizeof(struct RVALUE)+1))
+#define HEAP_OBJ_LIMIT (HEAP_SIZE/(unsigned int)sizeof(struct RVALUE) - (unsigned int)(sizeof(struct heaps_slot)/sizeof(struct RVALUE)+1))
#define HEAP_BITMAP_LIMIT (HEAP_OBJ_LIMIT/sizeof(uintptr_t)+1)
#define GET_HEAP_SLOT(x) (HEAP_SLOT(((uintptr_t)x) & ~(HEAP_ALIGN_MASK)))